Burner soot, smoke,heat loss,etc.

[Ron Musgraves]

how often do the coils need to be cleaned? also, do baffle plates normally wear out like that?

When flow reduces

 

[Ron Musgraves]

how often do the coils need to be cleaned? also, do baffle plates normally wear out like that?

Baffles will go after a few years, some warrantee for life some do not.